This ensures that both you and the caller can hear very clearly.Just press the call button and enjoy easy hands-free calling and safer driving The 2 microphones work together to collect your voice from all directions, the latest noise reduction technology prevents more road noise, wind noise and other disturbances. Bluetooth brings you a faster, more stable and smarter connection with less sound quality loss. Uninterrupted calls and music experience.The combination only takes 1 second and no need to pair again after the first successful pairing with your device This aux bluetooth adapter the Aux connection and USB stick connection, so you can connect your FM transmitter to your car via the included Aux cable and enjoy the CD-like sound quality.